WO2012124586A1

WO2012124586A1 - Quadrature demodulator

Info

Publication number: WO2012124586A1
Application number: PCT/JP2012/055924
Authority: WO
Inventors: 禎央松嶋; 福地　稔栄; 高橋　慶
Original assignee: 古河電気工業株式会社; 古河As株式会社
Priority date: 2011-03-14
Filing date: 2012-03-08
Publication date: 2012-09-20
Also published as: CN103416036B; CN103416036A; EP2688262A1; US20140037026A1; EP2688262A4; JP5950903B2; JPWO2012124586A1

Abstract

Provided is a quadrature demodulator capable of appropriately correcting amplitude errors and quadrature errors even for pulse modulated signals. In order to correct amplitude errors and quadrature errors, a quadrature demodulator (100) is provided with: a phase adjusting means (112) in a local oscillator (110); and a quadrature detection error detecting means (131) and a quadrature detection error correcting means (132) in a signal processor (130). A quadrature detection unit (120) uses two LO signals having phases changed by the phase adjusting means (112) to output two sets of an I component and Q component of an RF signal, and the two sets of the I component and Q component are used by the quadrature detection error detecting means (131) to calculate an amplitude error and quadrature error. The quadrature detection error correcting means (132) uses the amplitude error and quadrature error calculated by the quadrature detection error detecting means (131) to correct a reception signal.

Description

Quadrature demodulator

The present invention relates to a quadrature demodulator used in a radio communication device or a radar device, and more particularly to a quadrature demodulator that detects and corrects an amplitude error and an orthogonality error.

The radar device transmits a radio wave, processes a reception signal of the radio wave reflected by the target, and obtains position information up to the target such as a distance and an angle. A radar apparatus that employs a synchronous detection system for the purpose of improving reception sensitivity is known. In particular, in the case of direct conversion type synchronous detection, a quadrature demodulator is used to prevent target detection omissions due to phase conditions or to detect the relative speed of a target using Doppler transitions. A detection method using may be employed.

By the way, the in-phase component (I component) and the quadrature component (Q component) output from the quadrature demodulator may be affected by variations in characteristics, ambient temperature, power supply voltage characteristics, and the like, resulting in amplitude errors and quadrature errors. is there. If there is such an error, the amplitude of the received signal will not be stable if radar signal processing is performed using the I component and Q component signals output from the quadrature demodulator (the IQ signal together). The maximum detection distance may be shortened. Further, in a radar apparatus that performs relative speed detection using Doppler transition, a signal having a fake relative speed appears due to an amplitude error and an orthogonality error, and thus there is a possibility that a warning is erroneously issued.

On the other hand, in digital wireless communication, in order to demodulate a signal modulated by a digital modulation method, quadrature detection is performed using a quadrature demodulator, and the result is obtained as a complex signal (IQ signal). Yes. When an amplitude error and an orthogonality error occur in an orthogonal demodulator used for digital wireless communication, there is a problem that a bit error rate increases.

As a technique for correcting the amplitude error and the orthogonality error of such a quadrature demodulator, Patent Document 1 discloses an amplitude error compensator and an orthogonality error compensator. In Patent Document 1, for example, an amplitude error compensation device uses a power difference between an in-phase component and a quadrature component of a complex signal after amplitude correction with respect to an in-phase component and a quadrature component of a complex signal obtained by quadrature detection. And a rotation detector that detects the rotation of the signal point of the complex signal after amplitude correction.

Japanese Patent No. 4495210

However, the amplitude error compensation device described in Patent Document 1 cannot correct the amplitude error and the orthogonality error in a wireless communication device based on, for example, pulse modulation that does not modulate the phase. Further, in the case of a radar device based on pulse modulation, the frequency offset of the received signal and the rotation of the signal point of the complex signal are not unique, and the amplitude error compensator described in Patent Document 1 also has an amplitude error and orthogonality error. It cannot be corrected.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an orthogonal demodulator capable of appropriately correcting amplitude error and orthogonality error even for a pulse-modulated signal. .

In order to solve the above problems, a first aspect of the quadrature demodulator according to the present invention includes a local oscillator having a local oscillator that oscillates a local oscillation signal having a predetermined frequency, and the local oscillation signal output from the local oscillation unit. And a predetermined high-frequency signal to detect the in-phase component and the quadrature component of the high-frequency signal, and input the in-phase component and the quadrature component from the quadrature detection unit to input predetermined information from the high-frequency signal. A signal processing unit for performing signal processing for detecting a signal, and a phase adjustment unit that adjusts the phase of the local oscillation signal oscillated by the local oscillator so as to shift by a predetermined phase change And the first in-phase component of the high-frequency signal detected by the quadrature detection unit using the first local oscillation signal adjusted by the first phase change by the phase adjustment unit and the first And a second in-phase component and a second quadrature component of the high-frequency signal detected by the quadrature detection unit using the second local oscillation signal adjusted by the second phase change by the phase adjustment unit. Component, and an amplitude error and quadrature between the in-phase component and the quadrature component of the high-frequency signal from the first in-phase component, the first quadrature component, the second in-phase component, and the second quadrature component. It further comprises quadrature detection error detection means for calculating a degree error, and quadrature detection error compensation means for compensating using the amplitude error and the orthogonality error calculated by the quadrature detection error detection means.

Another aspect of the quadrature demodulation apparatus of the present invention is characterized in that the phase adjusting means adjusts the first phase change amount to be 0 degree.

Another aspect of the quadrature demodulator of the present invention is characterized in that the phase adjustment means adjusts so that a difference between the first phase change and the second phase change is 90 degrees. .

Another aspect of the quadrature demodulator according to the present invention includes a local oscillation unit having a local oscillator that oscillates a local oscillation signal having a predetermined frequency, and the local oscillation signal output from the local oscillation unit and a predetermined high-frequency signal. The first and second quadrature detection units for detecting the in-phase component and the quadrature component of the high-frequency signal, and the in-phase component and the quadrature component are input from the first and second quadrature detection units. A signal processing unit for performing signal processing for detecting predetermined information from the signal, and a signal distribution unit that distributes a local oscillation signal oscillated by the local oscillator and gives a predetermined phase difference A first in-phase component and a first quadrature component of the high-frequency signal detected by the first quadrature detection unit using the first local oscillation signal distributed by the signal distribution unit, and the signal distribution To the means And inputting the second in-phase component and the second quadrature component of the high-frequency signal detected by the second quadrature detection unit using the second local oscillation signal distributed in this way, and the first in-phase component Quadrature detection error detection means for calculating an amplitude error and a quadrature error between the in-phase component and the quadrature component of the high-frequency signal from the component, the first quadrature component, the second in-phase component, and the second quadrature component; And orthogonal detection error compensation means for compensating using the amplitude error and orthogonality error calculated by the orthogonal detection error detection means.

Another aspect of the quadrature demodulator of the present invention is characterized in that the signal distribution means gives a phase difference of 90 degrees between the first local oscillation signal and the second local oscillation signal.

In another aspect of the quadrature demodulator of the present invention, the high frequency signal used to calculate the amplitude error and the orthogonality error by the quadrature detection error detection means is obtained by inputting the local oscillation signal from the local oscillation unit. It is a leak signal leaked from the transmission unit that generates a predetermined transmission signal and emits it into the air from the transmission antenna to the quadrature detection unit.

In another aspect of the quadrature demodulator of the present invention, the high frequency signal used to calculate the amplitude error and the orthogonality error by the quadrature detection error detection means is obtained by inputting the local oscillation signal from the local oscillation unit. It is a reception signal obtained by emitting a generated predetermined transmission signal from a transmission antenna to the air and then receiving a reflected wave reflected by a predetermined target with a reception antenna.

Another aspect of the quadrature demodulation apparatus of the present invention further includes a signal path for transmitting the local oscillation signal from the local oscillation unit to the high-frequency signal input side of the quadrature detection unit, and the quadrature detection error detection unit The high frequency signal used for calculating the amplitude error and the orthogonality error is the local oscillation signal input to the quadrature detection unit via the signal path.

The first aspect of the wireless communication apparatus of the present invention is characterized by having any one of the quadrature demodulation apparatuses of the above aspect.

A first aspect of the radar apparatus according to the present invention is characterized by having any one of the quadrature demodulation apparatuses of the above aspect.

According to the present invention, it is possible to provide an orthogonal demodulator that can appropriately correct an amplitude error and an orthogonality error even for a pulse-modulated signal.

It is a block diagram which shows the structure of the radar apparatus provided with the orthogonal demodulation apparatus which concerns on 1st Embodiment of this invention. It is a block diagram which shows an example of RF signal used for calculating an amplitude error and an orthogonality error with the orthogonal demodulation apparatus of 1st Embodiment. It is a block diagram which shows another example of RF signal used for calculating an amplitude error and orthogonality error with the orthogonal demodulation apparatus of 1st Embodiment. It is a block diagram which shows the structure of the radar apparatus provided with the orthogonal demodulation apparatus which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the structure of the radar apparatus provided with the orthogonal demodulation apparatus which concerns on 3rd Embodiment of this invention.

A quadrature demodulator according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. Each component having the same function is denoted by the same reference numeral for simplification of illustration and description.

(First embodiment)
An orthogonal demodulator according to a first embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a block diagram illustrating a configuration of a radar apparatus 1 including an orthogonal demodulation device 100 according to the present embodiment. In FIG. 1, a quadrature demodulating apparatus 100 according to the present embodiment includes a local oscillator 110 including a local oscillator 111 and a phase adjusting unit 112, a quadrature detection including a phase shifter 121, a first mixer 122, and a second mixer 123. And a signal processing unit 130 including a quadrature detection error detecting unit 131 and a quadrature detection error compensating unit 132.

The radar apparatus 1 further includes a transmission unit 10, a transmission antenna 15, a reception unit 20, and a reception antenna 25 in addition to the orthogonal demodulation device 100 of the present embodiment. The transmission unit 10 receives a local oscillation signal (LO signal) of a predetermined frequency oscillated by the local oscillator 111, amplifies the signal by the amplifier 11, and radiates it from the transmission antenna 15 to the space. The transmission signal radiated from the transmission antenna 15 is reflected by the target and received by the reception antenna 25. The received signal received by the receiving antenna 25 is amplified by the

amplifiers

21 and 22 and then input to the quadrature detection unit 120 to be quadrature demodulated.

The quadrature detection unit 120 inputs the LO signal output from the local oscillation unit 110 together with the received signal. The LO signal input from the local oscillating unit 110 is input to the phase shifter 121, where a signal not added with a phase difference and a signal added with a phase difference of 90 degrees are output to the first mixer 122 and the second mixer 123, respectively. The In the first mixer 122 and the second mixer 123, the received signal and the LO signal input from the phase shifter 121 are multiplied to detect the in-phase component (I component) and the quadrature component (Q component) of the received signal, respectively. Is done. The detected I and Q components are output to the signal processing unit 130, where position information such as the distance to the target is detected.

The quadrature demodulator 100 according to the present embodiment detects an amplitude error and a quadrature error between the I component and the Q component output from the quadrature detector 120 to the signal processor 130, and detects the detected amplitude error and orthogonality. An error is used to compensate for the I and Q components of the received signal. In order to detect the amplitude error and the orthogonality error, the local oscillating unit 110 is provided with the phase adjusting unit 112, and the signal processing unit 130 is provided with the quadrature detection error detecting unit 131. The phase adjustment unit 112 can change the phase of the LO signal output from the local oscillator 111 and output it to the quadrature detection unit 120. Further, in order to compensate for the I component and Q component of the received signal, the signal processing unit 130 is provided with a quadrature detection error compensation means 132.

First, when detecting an amplitude error and a quadrature error, a predetermined RF signal is input to the quadrature detection unit 120, while two LO signals whose phases are changed using the phase adjustment unit 112 are input to the quadrature detection unit 120. input. The quadrature detection unit 120 detects the I component and the Q component of the RF signal using each of the two LO signals having different phases, and outputs the I component and the Q component to the quadrature detection error detection unit 131. The quadrature detection error detection means 131 calculates an amplitude error and a quadrature error using the two sets of I component and Q component input from the quadrature detection unit 120.

On the other hand, when the amplitude error and the orthogonality error are compensated for the received signal, the received signal is input to the quadrature detection unit 120, while the LO signal whose phase is not changed by the phase adjustment unit 112 is input to the quadrature detection unit 120. . The quadrature detection unit 120 multiplies the received signal by the LO signal to detect the I component and Q component of the received signal, and outputs this to the quadrature detection error compensation means 132. The quadrature detection error compensation unit 132 inputs amplitude errors and quadrature errors detected in advance from the quadrature detection error detection unit 131 and compensates for errors in the I and Q components of the received signal.

Next, a method for detecting the amplitude error and the orthogonality error in the orthogonal detection error detecting means 131 will be described below. Here, a case where the LO signal whose phase is not changed by the phase adjusting unit 112 and the LO signal whose phase is changed by 90 degrees is output to the quadrature detection unit 120 will be described. The phase adjustment unit 112 changes the respective phases so that the two LO signals output to the quadrature detection unit 120 have a phase difference of 90 degrees.

An RF signal (referred to as RF) used to detect an amplitude error and an orthogonality error is expressed by the following formula (1), and an LO signal whose phase is not changed by the phase adjusting unit 112 is expressed by the following formula (2), It shall be represented by (3). Here, Expression (2) represents a signal (noted as LO_I) to which a phase difference is not added by the phase shifter 121, and Expression (3) is a signal (LO_Q and Signal with a phase difference of 90 degrees added by the phase shifter 121). Notation).

In the equations (1) to (3), ω and ω ₀ represent the angular frequencies of the RF signal and the LO signal, respectively, and the amplitudes A, B, and C represent the amplitudes including the pass characteristics in the signal path of each signal. Thus, the amplitude error is represented by B / C. The phase difference α represents an orthogonality error. Hereinafter, a method for calculating the amplitude error B / C and the orthogonality error α will be described.

When the quadrature detection unit 120 receives the RF signal represented by the expression (1) and the LO signal represented by the expressions (2) and (3), the I component and the Q component of the output RF signal (respectively IF_I , IF_Q) are expressed as the following equations (4) and (5), respectively.

Here, equations (4) and (5) are obtained by selecting the terms (ω ₀ t−ωt) and (ω ₀ t + α−ωt) obtained by down-converting the RF signal.

When the LO signal whose phase is changed by 90 degrees by the phase adjusting means 112 is input to the quadrature detection unit 120, the two signals represented by the following equations (6) and (7) are phase shifters. 121 is output.

The quadrature detection unit 120 to which this LO signal is input outputs the I component and the Q component represented by the following equations (8) and (9).

Here, in equations (8) and (9), the terms (ω ₀ t−ωt) and (ω ₀ t + α−ωt) obtained by down-converting the RF signal are selected.

From the equations (4), (8), and the equations (5), (9), the following equations (10), (11) are calculated, respectively.

Thus, the amplitude error B / C can be calculated using the following equation (12).

On the other hand, the following equation (13) is obtained from equation (9), and equation (14) is obtained by dividing equation (4) by equation (8).

By substituting Equation (11) and Equation (14) into Equation (13), the orthogonality error α can be calculated using Equation (15) below.

The quadrature detection error compensation means 132 uses the amplitude error B / C calculated by the above equation (12) and the orthogonality error α calculated by the equation (15) to receive the received signal received by the receiving antenna 25. The amplitude error and the orthogonality error can be compensated for the I component and Q component obtained by quadrature detection. That is, when the RF signal represented by Equation (1) is a received signal, the I component and Q component of the received signal are the amplitude error B / given by Equation (12) in Equations (4) and (5), respectively. By substituting C and the orthogonality error α given by Equation (15), the amplitude error and the orthogonality error are compensated.

In the above description, the quadrature detection error compensation unit 132 that compensates for the amplitude error and the quadrature error with respect to the received signal is provided in the signal processing unit 130. It is also possible to configure using

Next, an example of an RF signal used to calculate the amplitude error B / C and the orthogonality error α will be described. A first example of the RF signal is shown in FIG. In the RF signal 51 shown in the figure, the LO signal output from the local oscillator 111 leaks from the transmission antenna 15 via the transmission unit 10 and is received by the reception antenna 25 and input to the quadrature detection unit 120. This is a leak signal. When the leakage signal from the local oscillator 111 is used as the RF signal, the angular frequency ω of the RF signal is equal to the angular frequency ω ₀ of the LO signal oscillated by the local oscillator 111. The method for obtaining the amplitude error B / C and the orthogonality error α using the leakage signal from the local oscillator 111 can be applied not only to the radar apparatus but also to a wireless communication device.

A second example of the RF signal used to calculate the amplitude error B / C and the orthogonality error α is shown in FIG. The RF signal 52 shown in the figure is a reception signal that is received by the reception antenna 25 after the transmission signal generated based on the LO signal input from the local oscillator 111 in the transmission unit 10 is reflected by the target. When the received signal is used as the RF signal, the angular frequency ω of the RF signal is equal to the angular frequency ω ₀ of the LO signal oscillated by the local oscillator 111 or changes from the angular frequency ω ₀ by the amount of frequency fluctuation due to Doppler shift. ing. The method of obtaining the amplitude error B / C and the orthogonality error α using the received signal can be applied to the radar apparatus.

(Second Embodiment)
A quadrature demodulator according to a second embodiment of the present invention will be described below with reference to FIG. FIG. 4 is a block diagram illustrating a configuration of the radar apparatus 2 including the quadrature demodulation apparatus 200 according to the present embodiment. In FIG. 4, the quadrature demodulating apparatus 200 according to the present embodiment further includes a first coupler 213 that branches the LO signal to the local oscillating unit 210, and the second signal before the received signal of the receiving unit 20 is input to the quadrature detecting unit 120. A coupler 224 is further provided. The first coupler 213 and the second coupler 224 are connected by a predetermined signal line 214.

In the radar apparatus 2 of the present embodiment configured as described above, the signal path for branching the LO signal output from the local oscillator 111 by the first coupler 213 and transmitting the LO signal to the second coupler 224 via the signal line 214. Can be formed. The LO signal 53 transmitted to the second coupler 224 can be input to the quadrature detector 120 and used as an RF signal for calculating the amplitude error B / C and the quadrature error α. The angular frequency ω of the RF signal 53 is equal to the angular frequency ω ₀ of the LO signal oscillated by the local oscillator 111. The method of obtaining the amplitude error B / C and the orthogonality error α using the LO signal branched by the local oscillation unit 210 can be applied not only to the radar apparatus but also to a wireless communication device.

(Third embodiment)
An orthogonal demodulator according to a third embodiment of the present invention will be described below with reference to FIG. FIG. 5 is a block diagram illustrating a configuration of the radar apparatus 2 including the quadrature demodulation apparatus 300 according to the present embodiment. In FIG. 5, the quadrature demodulator 300 of this embodiment includes two quadrature detection units, a first quadrature detection unit 320a and a second quadrature detection unit 320b, as quadrature detection units. Further, the local oscillator 310 is provided with signal distribution means 314 to distribute the LO signal output from the local oscillator 111 and to each phase shifter 121 of the first quadrature detector 320a and the second quadrature detector 320b. It is configured to input. The signal distribution unit 314 adds a 90-degree phase difference between the LO signal output to the first quadrature detection unit 320a and the LO signal output to the second quadrature detection unit 320b, and outputs the result.

Further, since it is necessary to input a high-frequency signal used for calculation of the amplitude error and the orthogonality error to both the first quadrature detection unit 320a and the second quadrature detection unit 320b, for example, signal distribution to the outlet side of the amplifier 22 Means 315 are provided. With such a configuration, in the orthogonal demodulator 300 according to the present embodiment, the I component and the Q component of the above formulas (4) and (5) and the I component and the Q component of the formulas (8) and (9). There is an advantage that can be obtained simultaneously. In this embodiment, when the amplitude error and the orthogonality error are compensated for the received signal, the received signal is input to the quadrature detection unit 320a, while the LO signal whose phase is not changed by the signal distribution unit 314 is input to the quadrature detection unit 320a. To enter. The quadrature detection unit 320 a multiplies the received signal by the LO signal to detect the I component and Q component of the received signal, and outputs this to the quadrature detection error compensation means 132. The quadrature detection error compensation unit 132 inputs amplitude errors and quadrature errors detected in advance from the quadrature detection error detection unit 131 and compensates for errors in the I and Q components of the received signal.

As described above, according to the quadrature demodulator of the present invention, it is possible to appropriately correct the amplitude error and the orthogonality error for the pulse-modulated signal. In the pulse radar to which the quadrature demodulator of the present invention is applied, the amplitude of the received signal can be stabilized, and thereby the desired maximum detection distance performance can be ensured. In addition, it is possible to avoid issuing a false alarm by suppressing the generation of a false relative speed signal.

Note that the description in the present embodiment shows an example of the orthogonal demodulation device according to the present invention, and the present invention is not limited to this. The detailed configuration and detailed operation of the quadrature demodulator in this embodiment can be changed as appropriate without departing from the spirit of the present invention.

1, 2 Radar device 10

Transmitter

11, 21, 22 Amplifier 15 Transmitter antenna 20 Receiver 25 Receive

antenna

51, 52, 53

RF signal

100, 200, 300

Orthogonal demodulator

110, 210, 310 Local oscillator 111 Local oscillator 112 Phase adjustment unit 120 Quadrature detection unit 121 Phase shifter 122 First mixer 123 Second mixer 130 Signal processing unit 131 Quadrature detection error detection unit 132 Quadrature detection error compensation unit 213 First coupler 214 Signal line 224 Second coupler 320a First Quadrature detection unit 320b Second quadrature detection unit 314 Signal distribution unit 315 Signal distribution unit

Claims

A local oscillation unit having a local oscillator that oscillates a local oscillation signal of a predetermined frequency, and the local oscillation signal output from the local oscillation unit and a predetermined high-frequency signal are input, and an in-phase component and a quadrature component of the high-frequency signal are obtained. A quadrature demodulating apparatus comprising: a quadrature detection unit that detects; and a signal processing unit that inputs the in-phase component and the quadrature component from the quadrature detection unit and performs signal processing for detecting predetermined information from the high-frequency signal. There,
Phase adjusting means for adjusting the phase of the local oscillation signal oscillated by the local oscillator to shift by a predetermined phase change;
A first in-phase component and a first quadrature component of the high-frequency signal detected by the quadrature detection unit using the first local oscillation signal adjusted by the first phase change by the phase adjustment unit; The second in-phase component and the second quadrature component of the high-frequency signal detected by the quadrature detection unit using the second local oscillation signal adjusted by the second phase change by the phase adjustment unit are input. An amplitude error and a quadrature error between the in-phase component and the quadrature component of the high-frequency signal are calculated from the first in-phase component, the first quadrature component, the second in-phase component, and the second quadrature component. Orthogonal detection error detection means;
A quadrature demodulation apparatus, further comprising: quadrature detection error compensation means that compensates using the amplitude error and the orthogonality error calculated by the quadrature detection error detection means.
The quadrature demodulating apparatus according to claim 1, wherein the phase adjusting unit adjusts the first phase change amount to be 0 degree.
3. The quadrature demodulating apparatus according to claim 1, wherein the phase adjustment unit adjusts so that a difference between the first phase change and the second phase change is 90 degrees.
A local oscillation unit having a local oscillator that oscillates a local oscillation signal of a predetermined frequency, and the local oscillation signal output from the local oscillation unit and a predetermined high-frequency signal are input, and an in-phase component and a quadrature component of the high-frequency signal are obtained. Signal processing for detecting predetermined information from the high-frequency signal by inputting the in-phase component and the quadrature component from the first and second quadrature detection units and the first and second quadrature detection units to detect; A quadrature demodulation device comprising: a signal processing unit that performs:
A signal distributing means for distributing a local oscillation signal oscillated by the local oscillator and giving a predetermined phase difference;
The first in-phase component and the first quadrature component of the high-frequency signal detected by the first quadrature detection unit using the first local oscillation signal distributed by the signal distribution unit, and the signal distribution unit The second in-phase component and the second quadrature component of the high-frequency signal detected by the second quadrature detection unit using the distributed second local oscillation signal are input, and the first in-phase component and Quadrature detection error detection means for calculating an amplitude error and a quadrature error between the in-phase component and the quadrature component of the high-frequency signal from the first quadrature component, the second in-phase component, and the second quadrature component;
A quadrature demodulation apparatus, further comprising: quadrature detection error compensation means that compensates using the amplitude error and the orthogonality error calculated by the quadrature detection error detection means.
5. The quadrature demodulator according to claim 4, wherein the signal distribution unit gives a phase difference of 90 degrees between the first local oscillation signal and the second local oscillation signal.
The high-frequency signal used to calculate the amplitude error and the orthogonality error by the quadrature detection error detection means generates a predetermined transmission signal by inputting the local oscillation signal from the local oscillation unit, and generates a predetermined transmission signal from the transmission antenna. 6. The quadrature demodulator according to claim 1, wherein the quadrature demodulator is a leak signal leaked from the transmitter to be released into the air to the quadrature detector.
The high-frequency signal used to calculate the amplitude error and the orthogonality error by the quadrature detection error detection means is a predetermined transmission signal generated by inputting the local oscillation signal from the local oscillation unit, and is transmitted from the transmission antenna to the air. 6. The quadrature demodulator according to claim 1, wherein the quadrature demodulator is a reception signal obtained by receiving a reflected wave reflected by a predetermined target after being emitted to a reception antenna.
A signal path for transmitting the local oscillation signal from the local oscillation unit to the input side of the high-frequency signal of the quadrature detection unit;
The high-frequency signal used for calculating the amplitude error and the orthogonality error by the quadrature detection error detection means is the local oscillation signal input to the quadrature detection unit via the signal path. An orthogonal demodulator according to any one of claims 1 to 5.
A wireless communication device having the orthogonal demodulation device according to any one of claims 1 to 8.
A radar apparatus comprising the quadrature demodulator according to any one of claims 1 to 8.